Mitsubishi Electric FR-E800 Instruction Manual page 447

• When offline auto tuning ends, press the STOP/RESET key on the PU during PU operation. In the External operation
mode, turn OFF the start signal (STF signal or STR signal). This operation resets the offline auto tuning, and the monitor
display of the operation panel returns to normal. (Without this operation, next operation cannot be started.)
NOTE
• The motor constants measured once during offline auto tuning are stored as parameters and their data are held until offline
auto tuning is performed again. However, the tuning data is cleared when performing All parameter clear.
• Changing Pr.71 after tuning completion will change the motor constant. For example, if the Pr.71 setting is changed to "8093"
after tuned with Pr.71 = "8090", the tuning data become invalid. To use the tuned data, set "8090" again in Pr.71.
• If offline auto tuning has ended in error (refer to the following table), motor constants or position accuracy compensation
gain values are not set. Perform an inverter reset and perform tuning again.
Error display
8 Forced end
9 Inverter protective function operation
92 The converter output voltage fell to 75% of the rated voltage.
Motor constant tuning
• Calculation error.
• The motor is not connected.
93
Position accuracy compensation gain tuning
• Calculation error.
• Motor shaft is locked (due to high inertia or other reason).
• When tuning is ended forcibly by pressing the STOP/RESET key or turning OFF the start signal (STF or STR) during
tuning, offline tuning does not end properly. (The motor constants or position accuracy compensation gain values have not
been set.)
Perform an inverter reset and perform tuning again.
NOTE
• An instantaneous power failure occurring during tuning will result in a tuning error.
After power is restored, the inverter starts normal operation. Therefore, when the STF (STR) signal is ON, the motor starts
forward (reverse) rotation.
• Any fault occurring during tuning is handled as in the normal operation. However, if the retry function is set, no retry is
performed even when a protective function that performs a retry is activated.
• The set frequency monitor displayed during the offline auto tuning is 0 Hz.
CAUTION
• Note that the motor may start running suddenly.
446
14. (C) Motor Constant Parameters
14.3 Offline auto tuning for a PM motor
Error cause Countermeasures
Set "1, 11, or 301" in Pr.96 or "1 or 11" in Pr.463 and retry.
Make the setting again.
Check for the power supply voltage fluctuation.
Check the Pr.83 Rated motor voltage (Pr.456 Rated second
motor voltage) setting.
Check the motor wiring and parameter settings, and make the
setting again.
• Check the motor wiring and parameter settings, and make
the setting again.
• Reduce the inertia.